CN111940689A - Mold for manufacturing screw rotor through additive technology and using method thereof - Google Patents

Mold for manufacturing screw rotor through additive technology and using method thereof Download PDF

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Publication number
CN111940689A
CN111940689A CN202010584195.4A CN202010584195A CN111940689A CN 111940689 A CN111940689 A CN 111940689A CN 202010584195 A CN202010584195 A CN 202010584195A CN 111940689 A CN111940689 A CN 111940689A
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mould
screw rotor
manufacturing
section
die
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CN111940689B (en
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干蜀毅
李斌
余清州
冯绅绅
高明燚
舒晓冬
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Hefei University of Technology
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Hefei University of Technology
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/0405—Rotating moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/009—Continuous casting of metals, i.e. casting in indefinite lengths of work of special cross-section, e.g. I-beams, U-profiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y10/00—Processes of additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Pumps (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

The invention discloses a die for manufacturing a screw rotor by an additive technology and a using method thereof. Compared with the prior art, the invention has the following advantages: the method is simple and easy to operate, saves cost, and does not have the problems of difficult positioning, low precision and the like in common processing; the process is smooth and does not generate sputtering, and the solidification effect is good; the screw rod is elongated in this scheme, liquid pouring and solidification process take place simultaneously, until forming required screw rotor, the process is simple, and the yield is high.

Description

Mold for manufacturing screw rotor through additive technology and using method thereof
Technical Field
The invention relates to the technical field of machine manufacturing, in particular to a die for manufacturing a screw rotor through an additive technology and a using method of the die.
Background
The screw pump is clean and oilless, has high transmission efficiency and high ultimate vacuum, is increasingly applied to the industries of vacuum coating, semiconductors and the like, has increasingly large market demand, but most of the screw technology cores in the global range are monopolized by foreign major companies, so that the research work of the domestic screw pump is slow to start, the autonomous research and development capability is weak, and the prospect of the screw pump in China is very wide.
At present, screw rods are machined by various machining methods such as turning, milling, casting and compounding, but basically, various problems exist in the machining methods. The turning method is used for machining the screw, a five-axis linkage numerical control machine tool is needed, the machining precision requirement is particularly high, the precision requirement cannot be completely met in the machining and assembling process, the screw is milled after being turned, and the problems of difficult positioning, low precision and the like exist. The screw rotor can also be processed by adopting a casting mode, the conventional screw casting is generally cast by green sand or resin sand, but the obtained screw rotor has the defects of easy formation of shrinkage cavity, shrinkage porosity, subcutaneous air hole, graphite floating and the like, the rejection rate of the casting is high, the economic benefit is low, and the casting process also has the inevitable defects of difficult mold manufacturing and low precision.
The additive manufacturing is a novel manufacturing technology which is just started in recent years, in the process, the only basis of part manufacturing is the shape of each section layer, the final part entity is formed by stacking each section layer, a complex machining procedure is not required to be designed for the part manufacturing process, the digital manufacturing process is consistent with the trend of the modern manufacturing industry to the automation and informatization, and the cost and the development time are greatly saved. According to the method, the shape of each section of the common screw along the axial direction is the same, and only a certain deviation angle is formed, so that the screw rotor can be regarded as an infinite number of planes which are rotated and superposed, the rotor can be machined by using an additive manufacturing technology, and the method is simple, quick, efficient and low in manufacturing cost.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a die for manufacturing a screw rotor by an additive technology and a using method thereof.
The invention is realized by the following technical scheme: a die for manufacturing a screw rotor by an additive technology is characterized by comprising a bearing platform and a section die, wherein a forming cavity penetrating through the upper surface and the lower surface of the section die is arranged on the section die, the bearing platform and the section die are arranged on the same axis, at least one of the bearing platform and the section die can move back and forth along the central axis, at least one of the bearing platform and the section die can do self-rotation motion around the central axis, and the cross section of the forming cavity is in the shape of a rotor profile of the screw rotor to be manufactured.
As a further improvement to the scheme, the shape of the inner cavity of the forming cavity is a part of the shape of the screw rotor to be manufactured.
As a further improvement to the scheme, the shape of the inner cavity of the forming cavity is 0.15 circle part of a complete spiral on the shape of the outer shape of the screw rotor to be manufactured.
As a further improvement to the above scheme, a cooling water channel is arranged in the mold and surrounds the molding cavity.
As a further improvement to the scheme, the section mould is also provided with a material injection barrel, and the material injection barrel is arranged on one side of the section mould, which is far away from the bearing platform.
As a further improvement of the scheme, the section mould comprises an upper template and a lower template, and the cooling water channel is arranged on the lower template.
The invention also provides a use method of the mold for manufacturing the screw rotor by the additive technology, which comprises the following steps:
moving the bearing platform to be tightly attached to a section mould, and heating the section mould to the working temperature of 200-300 ℃;
step two, injecting a molten molding material into the mold;
step three, continuously injecting the materials after the materials are fully injected, and simultaneously enabling the bearing platform and the section mould to be far away and rotate relatively;
and step four, continuing the step three until the screw to be manufactured is manufactured, stopping the material injection and the row-to-row movement between the bearing platform and the section die, and taking down the screw after cooling.
As a further improvement to the above scheme, the relationship between the speed of separating the bearing platform and the forming die and the speed of relative rotation in the third step should correspond to the lead of the screw to be manufactured.
As a further improvement to the scheme, the speed of separating the bearing platform from the forming die is v1The rotation rate v of the receiving platform and the mould relative to each other2，
Figure BDA0002554022010000021
Wherein v is1In units of mm/s, v2In degrees/s, and P is the lead of the screw rotor to be processed in mm.
As a further improvement to the above scheme, if the thickness of the forming die is h, the average residence time t of the material in the forming die is equal to v1And/h, wherein the value of t is 30-60 s.
Compared with the prior art, the invention has the following advantages: the invention is suitable for screw rotors with any molded lines, is simple and easy to operate, and greatly saves the cost and the development time; compared with the common turning and milling mode, the additive manufacturing mode provided by the invention is more efficient, and the problems of difficult positioning, low precision and the like in common processing are solved; the feeding process of the liquid material is smooth, the liquid enters the die cavity from the outside without large sputtering, the liquid can be uniformly spread on the bottom of the die cavity, the whole die cavity is uniformly filled layer by layer, the liquid is solidified layer by layer with equal thickness from the periphery to the middle, and the solidification effect is good; the screw rod is elongated in this scheme, liquid pouring and solidification process take place simultaneously, until forming required screw rotor, the process is simple, and the yield is high.
Drawings
FIG. 1 is a schematic view of the working state of the present invention.
FIG. 2 is a schematic diagram of an upper mold plate structure.
FIG. 3 is a schematic diagram of a lower template structure.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Example 1
A die for manufacturing a screw rotor through an additive technology is characterized by comprising a bearing platform 4 and a section die 2, wherein a forming cavity 5 penetrating through the upper surface and the lower surface of the section die 2 is arranged on the section die 2, the bearing platform 4 and the section die 2 are arranged on the same axis, the bearing platform 4 and the section die 2 can move back and forth along the central axis and rotate around the axis, and the cross section of the forming cavity 5 is in the shape of a rotor molded line of a screw rotor 3 to be manufactured.
The inner cavity shape of the molding cavity 5 is a part of the shape of the screw rotor 3 to be manufactured. The shape of the inner cavity of the forming cavity 5 is 0.15 circle part of a complete spiral on the shape of the screw rotor 3 to be manufactured. A cooling water channel 6 is arranged in the mould 2, the cooling water channel 6 being arranged around the mould cavity 5. The section mould 2 is also provided with a material injection barrel 1, and the material injection barrel 1 is arranged on one side of the section mould 2 far away from the bearing platform 4. The forming die 2 comprises an upper die plate 21 and a lower die plate 22, and the cooling water channel 6 is arranged on the lower die plate 22.
The cooling water can uniformly cool the screw section entity of each layer to promote each section of the screw section entity to be gradually solidified from the periphery to the center, so that the die achieves ideal dynamic heat balance, the heat absorbed by the die in the forming process is always equal to the heat emitted by the die, and the cooling solidification of the screw rotor is promoted.
Example 2
The use method of the mold for manufacturing the screw rotor through the additive technology comprises the following steps:
step one, moving the bearing platform 4 to be tightly attached to the section mould 2, and heating the section mould 2 to the working temperature of 200-300 ℃; meanwhile, the material injection barrel 1 can be heated at the same time to ensure the fluidity of the material;
step two, injecting a molten molding material into the mold 2; cooling water is injected into the cooling water channel 6 to keep the working temperature of the forming die 2;
step three, continuously injecting the materials after the materials are fully injected, and simultaneously enabling the bearing platform 4 and the section mould 2 to be far away and rotate relatively; the relation between the speed of the bearing platform 4 and the distance of the section mould 2 and the relative rotation speed is corresponding to the lead of the screw to be manufactured;
and step four, continuing the step three until the screw to be manufactured is manufactured, stopping the material injection and the row-to-row movement between the bearing platform 4 and the section mould 2, cooling and taking down.
The realization principle of the scheme is as follows: the liquid molten material contacts the upper surface of the bearing platform 4 at the beginning, in the working process, when the section mould 2 is filled with the molten material, the bearing platform 4 starts to operate, the bearing platform 4 does uniform circumferential rotation on one hand, and gradually moves away from the section mould 2 along the axial direction on the other hand, the molten material is overlapped layer by layer and is solidified and formed, and meanwhile, the bearing platform 4 continuously rotates to take away the formed part until the whole screw entity to be manufactured is formed.
The position of the material injection barrel 1 is selected at the section center of the section of the forming cavity 5 of the section die 2, the height of the material injection barrel 1 is H, the radius is R, the speed of pouring and injecting is V, the speed of separating the bearing platform 4 from the section die 2 is V1, and the rotation speed V of the relative rotation of the bearing platform 4 and the section die 2 is V12，
H. R, V satisfies the following conditions:
10mm≤H≤200mm
4mm≤R≤15mm
80mm/s≤V≤300mm/s
axial movement velocity v of the receiving platform 41And the rotational velocity v of the receiving platform 42The determination method comprises the following steps:
Figure BDA0002554022010000041
Figure BDA0002554022010000042
Figure BDA0002554022010000043
wherein S is the sectional area of the profile of the screw rotor to be processed, and P is the lead of the screw rotor to be processed.
Let the thickness of the mould 2 be h, the average residence time t of the material in the mould 2 be v1And h, under the condition of setting the optimal parameters, the time can be kept within 1min, and in the process of slowly rotating the bearing platform 4, the timely solidification of each layer of metal can be ensured, so that the condition that the screw rod rotates out of the lower surface of the die when the wall thickness is insufficient can be avoided.

Claims (10)

1. A die for manufacturing a screw rotor through an additive technology is characterized by comprising a bearing platform and a section die, wherein a forming cavity penetrating through the upper surface and the lower surface of the section die is arranged on the section die, the bearing platform and the section die are arranged on the same axis, at least one of the bearing platform and the section die can move back and forth along the central axis, at least one of the bearing platform and the section die can do self-rotation motion around the central axis, and the cross section of the forming cavity is in the shape of a rotor profile of the screw rotor to be manufactured.
2. Mould for manufacturing a screw rotor by additive technology according to claim 1, characterised in that: the shape of the inner cavity of the forming cavity is a part of the shape of the screw rotor to be manufactured.
3. Mould for manufacturing a screw rotor by additive technology according to claim 2, characterised in that: the shape of the inner cavity of the forming cavity is a 0.15-circle part of a complete spiral on the shape of the upper outline of the screw rotor to be manufactured.
4. Mould for manufacturing a screw rotor by additive technology according to claim 1, characterised in that: and a cooling water channel is arranged in the forming die and surrounds the forming cavity.
5. Mould for manufacturing a screw rotor by additive technology according to claim 1, characterised in that: the section mould is also provided with a material injection barrel, and the material injection barrel is arranged on one side of the section mould, which is far away from the bearing platform.
6. Mould for manufacturing a screw rotor by additive technology according to claim 1, characterised in that: the section mould includes cope match-plate pattern and lower bolster, the cooling water course set up in on the lower bolster.
7. Use of a mould for manufacturing a screw rotor by additive manufacturing according to any of claims 1-6, characterised by the steps of:
moving the bearing platform to be tightly attached to a section mould, and heating the section mould to the working temperature of 200-300 ℃;
step two, injecting a molten molding material into the mold;
step three, continuously injecting the materials after the materials are fully injected, and simultaneously enabling the bearing platform and the section mould to be far away and rotate relatively;
and step four, continuing the step three until the screw to be manufactured is manufactured, stopping the material injection and the row-to-row movement between the bearing platform and the section die, and taking down the screw after cooling.
8. Use of a mould for manufacturing a screw rotor by additive manufacturing according to claim 7, characterised in that: and in the third step, the relation between the speed of separating the bearing platform and the forming die and the speed of relative rotation corresponds to the lead of the screw to be manufactured.
9. Use of a mould for manufacturing a screw rotor by additive manufacturing according to claim 8, characterised in that: the speed of separating the bearing platform from the forming die is v1The rotation rate v of the receiving platform and the mould relative to each other2，
Figure FDA0002554019000000011
Wherein v is1In units of mm/s, v2In degrees/s, and P is the lead of the screw rotor to be processed in mm.
10. Use of a mould for manufacturing a screw rotor by additive manufacturing according to claim 9, characterised in that: let the thickness of the mould be h, the average residence time t of the material in the mould is v1And/h, wherein the value of t is 30-60 s.
CN202010584195.4A 2020-06-24 2020-06-24 Mold for manufacturing screw rotor through additive technology and using method thereof Active CN111940689B (en)

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1433132A (en) * 1972-03-16 1976-04-22 Howden Compressors Ltd Method of manufacturing screw rotors for compressors
US4225547A (en) * 1975-12-15 1980-09-30 Sumitomo Electric Industries, Ltd. Extrusion process of polytetrafluoroethylene tubing materials and apparatus therefor
DE19642018A1 (en) * 1995-10-13 1997-04-17 Tochigi Fuji Sangyo Kk Method of manufacturing a screw rotor
JPH09323361A (en) * 1996-06-04 1997-12-16 Fuji Sogyo Kk Device for molding three-dimensional object
TW201350224A (en) * 2012-01-30 2013-12-16 Sieber Forming Solutions Gmbh Method and device for the manufacture of metallic components comprising a shaft which is deformed along its longitudinal axis to at least one helix
CN105026125A (en) * 2013-01-04 2015-11-04 纽约大学 Continuous feed 3D manufacturing
CN105834430A (en) * 2015-01-12 2016-08-10 中国科学院宁波材料技术与工程研究所 3D (3-dimensional) printing device
CN109261940A (en) * 2018-09-28 2019-01-25 平顶山学院 A kind of metal material increasing material manufacturing forming method and device
CN111229848A (en) * 2020-02-27 2020-06-05 北京科技大学 Rotary die extrusion forming process and device for hollow rotor with equal wall thickness of screw pump

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1433132A (en) * 1972-03-16 1976-04-22 Howden Compressors Ltd Method of manufacturing screw rotors for compressors
US4225547A (en) * 1975-12-15 1980-09-30 Sumitomo Electric Industries, Ltd. Extrusion process of polytetrafluoroethylene tubing materials and apparatus therefor
DE19642018A1 (en) * 1995-10-13 1997-04-17 Tochigi Fuji Sangyo Kk Method of manufacturing a screw rotor
JPH09323361A (en) * 1996-06-04 1997-12-16 Fuji Sogyo Kk Device for molding three-dimensional object
TW201350224A (en) * 2012-01-30 2013-12-16 Sieber Forming Solutions Gmbh Method and device for the manufacture of metallic components comprising a shaft which is deformed along its longitudinal axis to at least one helix
CN105026125A (en) * 2013-01-04 2015-11-04 纽约大学 Continuous feed 3D manufacturing
CN105834430A (en) * 2015-01-12 2016-08-10 中国科学院宁波材料技术与工程研究所 3D (3-dimensional) printing device
CN109261940A (en) * 2018-09-28 2019-01-25 平顶山学院 A kind of metal material increasing material manufacturing forming method and device
CN111229848A (en) * 2020-02-27 2020-06-05 北京科技大学 Rotary die extrusion forming process and device for hollow rotor with equal wall thickness of screw pump

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